add packet test: LpPacketTest

src/main/java/packet/CPacket.java

@@ -34,12 +34,22 @@ import encoding.*;
 //             }
 //
 public class CPacket implements InteractWithField, IEncodingAble {
-    public MINPacket minPacket=new MINPacket();
+    private MINPacket minPacket=new MINPacket();
     public TTL ttl=new TTL();
     public Payload payload=new Payload();
     public Identifier srcIdentifier=new Identifier();
     public Identifier dstIdentifier=new Identifier();
 
+    public CPacket(){
+    }
+
+    public CPacket(Identifier srcIdentifier,Identifier dstIdentifier,
+                   Payload payload,TTL ttl){
+        this.srcIdentifier=srcIdentifier;
+        this.dstIdentifier=dstIdentifier;
+        this.payload=payload;
+        this.ttl=ttl;
+    }
 
     /**
      * 获取源标识